/*
 * Copyright (c) OSGi Alliance (2009). All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.osgi.jmx;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import javax.management.openmbean.ArrayType;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.SimpleType;
import javax.management.openmbean.TabularType;

/**
 * Constants for OSGi JMX Specification.
 * 
 * Additionally, this class contains a number of utility types that are used in
 * different places in the specification. These are {@link #LONG_ARRAY_TYPE},
 * {@link #STRING_ARRAY_TYPE}, and {@link #PROPERTIES_TYPE}.
 * 
 * @version $Rev$
 * @Immutable
 */
public class JmxConstants {

	/*
	 * Empty constructor to make sure this is not used as an object.
	 */
	private JmxConstants() {
		// empty
	}

	/**
	 * The MBean Open type for an array of strings
	 */
	public static final ArrayType		STRING_ARRAY_TYPE	= Item
																	.arrayType(
																			1,
																			SimpleType.STRING);
	/**
	 * The MBean Open type for an array of longs
	 */
	public static final ArrayType		LONG_ARRAY_TYPE		= Item
																	.arrayType(
																			1,
																			SimpleType.LONG);

	/**
	 * For an encoded array we need to start with ARRAY_OF. This must be
	 * followed by one of the names in {@link #SCALAR}.
	 * 
	 */
	public final static String			ARRAY_OF			= "Array of ";

	/**
	 * For an encoded vector we need to start with ARRAY_OF. This must be
	 * followed by one of the names in {@link #SCALAR}.
	 */
	public final static String			VECTOR_OF			= "Vector of ";

	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.String}
	 */
	public static final String			STRING				= "String";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.Integer}
	 */
	public static final String			INTEGER				= "Integer";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.Long}
	 */
	public static final String			LONG				= "Long";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.Float}
	 */
	public static final String			FLOAT				= "Float";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.Double}
	 */
	public static final String			DOUBLE				= "Double";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.Byte}
	 */
	public static final String			BYTE				= "Byte";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.Short}
	 */
	public static final String			SHORT				= "Short";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.Character}
	 */
	public static final String			CHARACTER			= "Character";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.lang.Boolean}
	 */
	public static final String			BOOLEAN				= "Boolean";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.math.BigDecimal}
	 */
	public static final String			BIGDECIMAL			= "BigDecimal";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * {@link java.math.BigInteger}
	 */
	public static final String			BIGINTEGER			= "BigInteger";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * the <code>double</code> primitive type.
	 */
	public static final String			P_DOUBLE			= "double";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * the <code>float</code> primitive type.
	 */
	public static final String			P_FLOAT				= "float";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * the <code>long</code> primitive type.
	 */
	public static final String			P_LONG				= "long";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * the <code>int</code> primitive type.
	 */
	public static final String			P_INT				= "int";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * the <code>short</code> primitive type.
	 */
	public static final String			P_SHORT				= "short";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * the <code>byte</code> primitive type.
	 */
	public static final String			P_BYTE				= "byte";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * the <code>char</code> primitive type.
	 */
	public static final String			P_CHAR				= "char";
	/**
	 * Value for {@link #PROPERTY_TYPE} <code>Type</code> value in the case of
	 * the <code>boolean</code> primitive type.
	 */
	public static final String			P_BOOLEAN			= "boolean";

	/**
	 * A set of all scalars that can be used in the {@link #TYPE} property of a
	 * {@link #PROPERTIES_TYPE}. This contains the following names:
	 * <ul>
	 * <li>{@link #BIGDECIMAL}</li>
	 * <li>{@link #BIGINTEGER}</li>
	 * <li>{@link #BOOLEAN}</li>
	 * <li>{@link #BYTE}</li>
	 * <li>{@link #CHARACTER}</li>
	 * <li>{@link #DOUBLE}</li>
	 * <li>{@link #FLOAT}</li>
	 * <li>{@link #INTEGER}</li>
	 * <li>{@link #LONG}</li>
	 * <li>{@link #SHORT}</li>
	 * <li>{@link #STRING}</li>
	 * <li>{@link #P_BYTE}</li>
	 * <li>{@link #P_CHAR}</li>
	 * <li>{@link #P_DOUBLE}</li>
	 * <li>{@link #P_FLOAT}</li>
	 * <li>{@link #P_INT}</li>
	 * <li>{@link #P_LONG}</li>
	 * <li>{@link #P_SHORT}</li>
	 */
	public final static List<String>	SCALAR				= Collections
																	.unmodifiableList(Arrays
																			.asList(
																					STRING,
																					INTEGER,
																					LONG,
																					FLOAT,
																					DOUBLE,
																					BYTE,
																					SHORT,
																					CHARACTER,
																					BOOLEAN,
																					BIGDECIMAL,
																					BIGINTEGER,
																					P_BYTE,
																					P_CHAR,
																					P_SHORT,
																					P_INT,
																					P_LONG,
																					P_DOUBLE,
																					P_FLOAT));
	/**
	 * The key KEY.
	 */
	public static final String			KEY					= "Key";
	/**
	 * The key of a property. The key is {@link #KEY} and the type is
	 * {@link SimpleType#STRING}.
	 */
	public static final Item			KEY_ITEM			= new Item(
																	KEY,
																	"The key of the property",
																	SimpleType.STRING);

	/**
	 * The key VALUE.
	 */
	public static final String			VALUE				= "Value";

	/**
	 * The value of a property. The key is {@link #VALUE} and the type is
	 * {@link SimpleType#STRING}. A value will be encoded by the string given in
	 * {@link #TYPE}. The syntax for this type is given in {@link #TYPE_ITEM}.
	 */
	public static final Item			VALUE_ITEM			= new Item(
																	VALUE,
																	"The value of the property",
																	SimpleType.STRING);

	/**
	 * The key PROPERTY_TYPE.
	 * 
	 * ### can we call this value PropertyType and service type ServiceType?
	 */
	public static final String			TYPE				= "Type";

	/**
	 * The type of the property. The key is {@link #TYPE} and the type is
	 * {@link SimpleType#STRING}. This string must follow the following syntax:
	 * 
	 * TYPE ::= ( 'Array of ' | 'Vector of ' )? {@link #SCALAR}
	 * 
	 * ### why can't we just use the class name?
	 * 
	 * ### why do we have to distinguish between primitives and wrappers?
	 */
	public static final Item			TYPE_ITEM			= new Item(
																	TYPE,
																	"The type of the property",
																	SimpleType.STRING,
																	STRING,
																	INTEGER,
																	LONG,
																	FLOAT,
																	DOUBLE,
																	BYTE,
																	SHORT,
																	CHARACTER,
																	BOOLEAN,
																	BIGDECIMAL,
																	BIGINTEGER,
																	P_DOUBLE,
																	P_FLOAT,
																	P_LONG,
																	P_INT,
																	P_SHORT,
																	P_CHAR,
																	P_BYTE,
																	P_BOOLEAN);

	/**
	 * A Composite Type describing a a single property. A property consists of
	 * the following items {@link #KEY_ITEM}, {@link #VALUE_ITEM}, and
	 * {@link #TYPE_ITEM}.
	 */
	public static final CompositeType	PROPERTY_TYPE		= Item
																	.compositeType(
																			"PROPERTY",
																			"This type encapsulates a key/value pair",
																			KEY_ITEM,
																			VALUE_ITEM,
																			TYPE_ITEM);

	/**
	 * Describes a map with properties. The row type is {@link #PROPERTY_TYPE}.
	 * The index is defined to the {@link #KEY} of the property.
	 */
	public static final TabularType		PROPERTIES_TYPE		= Item
																	.tabularType(
																			"PROPERTIES",
																			"A table of PROPERTY",
																			PROPERTY_TYPE,
																			KEY);

	/**
	 * The domain name of the core OSGi MBeans
	 */
	public static final String			OSGI_CORE			= "osgi.core";

	/**
	 * The domain name of the selected OSGi compendium MBeans
	 */
	public static final String			OSGI_COMPENDIUM		= "osgi.compendium";
}
